Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25 at.%)-Mn alloys

Gaosong Yi; Kenneth C. Littrell; Jonathan D. Poplawsky; David A. Cullen; Erik Sundberg; Michael L. Free

doi:10.1016/j.matdes.2017.01.021

Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25 at.%)-Mn alloys

Gaosong Yi, Kenneth C. Littrell, Jonathan D. Poplawsky, David A. Cullen, Erik Sundberg, Michael L. Free

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

The effects of different tempers (H131 and H116) and different aging temperatures (50 and 70 °C) on the precipitation behavior of Al-Mg (5.25 at.%)-Mn (Al 5083) alloys aged for a long time (41 and 30 months) were investigated using electron backscatter diffraction(EBSD), scanning transmission electron microscopy(STEM), energy-dispersive X-ray spectroscopy(EDS), atom probe tomography (APT), and small angle neutron scattering (SANS). GP zones and β″ phases were found in Al 5083 H116 aged at 50 °C for 24 months using APT. EDS and SANS results revealed that a phase transformation process from GP zones to β′/β phases occurred for precipitates formed in both Al 5083 H131 and H116 aged at 70 °C. The effective diffusion coefficient of Mg in Al 5083 H131 is 1.8 times of that in Al 5083 H116 aged at 70 °C. The precipitation process in Al 5083 H116 aged at 50 °C is much slower than that in the sample aged at 70 °C. The coarsening process was identified in Al 5083 H131 and H116 aged at 70 °C for > 9 months.

Original language	English
Pages (from-to)	22-35
Number of pages	14
Journal	Materials and Design
Volume	118
DOIs	https://doi.org/10.1016/j.matdes.2017.01.021
State	Published - Mar 15 2017

Funding

The work is supported by Office of Naval Research, Award Number: N000141210507. APT and STEM-EDS was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This work utilizes the Oak Ridge National Laboratory's High Flux Isotope Reactor, which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. This work made use of University of Utah USTAR shared facilities support, in part, by the MRSEC Program of NSF under Award No. DMR-1121252.

Funders	Funder number
Oak Ridge National Laboratory
Scientific User Facilities Division
National Science Foundation	DMR-1121252
Office of Naval Research	N000141210507
U.S. Department of Energy
Office of Science
Basic Energy Sciences

Keywords

Aluminum alloys
Atom-probe tomography
Precipitation
Small angle neutron scattering

Access to Document

10.1016/j.matdes.2017.01.021

Cite this

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title = "Characterization of the effects of different tempers and aging temperatures on the precipitation behavior of Al-Mg (5.25 at.%)-Mn alloys",

abstract = "The effects of different tempers (H131 and H116) and different aging temperatures (50 and 70 °C) on the precipitation behavior of Al-Mg (5.25 at.%)-Mn (Al 5083) alloys aged for a long time (41 and 30 months) were investigated using electron backscatter diffraction(EBSD), scanning transmission electron microscopy(STEM), energy-dispersive X-ray spectroscopy(EDS), atom probe tomography (APT), and small angle neutron scattering (SANS). GP zones and β″ phases were found in Al 5083 H116 aged at 50 °C for 24 months using APT. EDS and SANS results revealed that a phase transformation process from GP zones to β′/β phases occurred for precipitates formed in both Al 5083 H131 and H116 aged at 70 °C. The effective diffusion coefficient of Mg in Al 5083 H131 is 1.8 times of that in Al 5083 H116 aged at 70 °C. The precipitation process in Al 5083 H116 aged at 50 °C is much slower than that in the sample aged at 70 °C. The coarsening process was identified in Al 5083 H131 and H116 aged at 70 °C for > 9 months.",

keywords = "Aluminum alloys, Atom-probe tomography, Precipitation, Small angle neutron scattering",

author = "Gaosong Yi and Littrell, {Kenneth C.} and Poplawsky, {Jonathan D.} and Cullen, {David A.} and Erik Sundberg and Free, {Michael L.}",

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AU - Yi, Gaosong

AU - Littrell, Kenneth C.

AU - Poplawsky, Jonathan D.

AU - Cullen, David A.

AU - Sundberg, Erik

AU - Free, Michael L.

PY - 2017/3/15

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N2 - The effects of different tempers (H131 and H116) and different aging temperatures (50 and 70 °C) on the precipitation behavior of Al-Mg (5.25 at.%)-Mn (Al 5083) alloys aged for a long time (41 and 30 months) were investigated using electron backscatter diffraction(EBSD), scanning transmission electron microscopy(STEM), energy-dispersive X-ray spectroscopy(EDS), atom probe tomography (APT), and small angle neutron scattering (SANS). GP zones and β″ phases were found in Al 5083 H116 aged at 50 °C for 24 months using APT. EDS and SANS results revealed that a phase transformation process from GP zones to β′/β phases occurred for precipitates formed in both Al 5083 H131 and H116 aged at 70 °C. The effective diffusion coefficient of Mg in Al 5083 H131 is 1.8 times of that in Al 5083 H116 aged at 70 °C. The precipitation process in Al 5083 H116 aged at 50 °C is much slower than that in the sample aged at 70 °C. The coarsening process was identified in Al 5083 H131 and H116 aged at 70 °C for > 9 months.

AB - The effects of different tempers (H131 and H116) and different aging temperatures (50 and 70 °C) on the precipitation behavior of Al-Mg (5.25 at.%)-Mn (Al 5083) alloys aged for a long time (41 and 30 months) were investigated using electron backscatter diffraction(EBSD), scanning transmission electron microscopy(STEM), energy-dispersive X-ray spectroscopy(EDS), atom probe tomography (APT), and small angle neutron scattering (SANS). GP zones and β″ phases were found in Al 5083 H116 aged at 50 °C for 24 months using APT. EDS and SANS results revealed that a phase transformation process from GP zones to β′/β phases occurred for precipitates formed in both Al 5083 H131 and H116 aged at 70 °C. The effective diffusion coefficient of Mg in Al 5083 H131 is 1.8 times of that in Al 5083 H116 aged at 70 °C. The precipitation process in Al 5083 H116 aged at 50 °C is much slower than that in the sample aged at 70 °C. The coarsening process was identified in Al 5083 H131 and H116 aged at 70 °C for > 9 months.

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